1o9x
From Proteopedia
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'''HUMAN SERUM ALBUMIN COMPLEXED WITH TETRADECANOIC ACID (MYRISTIC ACID) AND HEMIN''' | '''HUMAN SERUM ALBUMIN COMPLEXED WITH TETRADECANOIC ACID (MYRISTIC ACID) AND HEMIN''' | ||
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[[Category: Tsuchida, E.]] | [[Category: Tsuchida, E.]] | ||
[[Category: Zunszain, P A.]] | [[Category: Zunszain, P A.]] | ||
| - | [[Category: | + | [[Category: Fatty acid transport]] |
| - | [[Category: | + | [[Category: Heme-binding]] |
| - | [[Category: | + | [[Category: Lipid-binding]] |
| - | [[Category: | + | [[Category: Plasma protein]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 03:34:23 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 00:34, 3 May 2008
HUMAN SERUM ALBUMIN COMPLEXED WITH TETRADECANOIC ACID (MYRISTIC ACID) AND HEMIN
Overview
BACKGROUND: Human serum albumin (HSA) is an abundant plasma protein that binds a wide variety of hydrophobic ligands including fatty acids, bilirubin, thyroxine and hemin. Although HSA-heme complexes do not bind oxygen reversibly, it may be possible to develop modified HSA proteins or heme groups that will confer this ability on the complex. RESULTS: We present here the crystal structure of a ternary HSA-hemin-myristate complex, formed at a 1:1:4 molar ratio, that contains a single hemin group bound to subdomain IB and myristate bound at six sites. The complex displays a conformation that is intermediate between defatted HSA and HSA-fatty acid complexes; this is likely to be due to low myristate occupancy in the fatty acid binding sites that drive the conformational change. The hemin group is bound within a narrow D-shaped hydrophobic cavity which usually accommodates fatty acid; the hemin propionate groups are coordinated by a triad of basic residues at the pocket entrance. The iron atom in the centre of the hemin is coordinated by Tyr161. CONCLUSION: The structure of the HSA-hemin-myristate complex (PDB ID 1o9x) reveals the key polar and hydrophobic interactions that determine the hemin-binding specificity of HSA. The details of the hemin-binding environment of HSA provide a structural foundation for efforts to modify the protein and/or the heme molecule in order to engineer complexes that have favourable oxygen-binding properties.
About this Structure
1O9X is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Crystal structural analysis of human serum albumin complexed with hemin and fatty acid., Zunszain PA, Ghuman J, Komatsu T, Tsuchida E, Curry S, BMC Struct Biol. 2003 Jul 7;3:6. Epub 2003 Jul 7. PMID:12846933 Page seeded by OCA on Sat May 3 03:34:23 2008
